The invention discloses a non-contact type method for detecting the arc profile and radius of a metal-based arc grinding wheel on site and a device for implementing the method, and relates to the technology for detecting the profile and radius of the metal-base arc grinding wheel on site in the field of grinding. The problem that due to the fact that a conventional contact type detecting method can cause contact interference to a grinding wheel in the detecting process, the detecting result is not accurate is solved. An electrical vortex sensor is controlled by a stepping electric motor to move in the direction parallel to the rotating axis of the metal-based arc grinding wheel at a constant speed, the electrical vortex sensor measures the distance between a measuring head of the electrical vortex sensor and the surface of the metal-based arc grinding wheel in the movement process and sends detection data to a computer through a data acquisition card, and the computer calculates the profile and radius of the metal-based arc grinding wheel according to the data. The method belongs to non-contact type detection, can not cause contact interference to the grinding wheel, and is accurate in detection result, resistant to grease dirt, dust and moisture, capable of detecting a grinding wheel wetted by grinding fluid, and capable of conducting detection rapidly and conveniently.